CHAPTER YIIL 



SEASONAL CHANGES AND HISTORIES. 



THE various aspect of the butterfly world at 

 different seasons, to which allusion has just been 

 made, is not so conspicuous as it would be did 

 each species pass through its cycle of changes and 

 transformations only once a year. This is the 

 case, however, with the smaller portion of our 

 butterflies. Most of them have two, and not a 

 few three, broods each year, so that the same 

 butterflies appear again and again throughout the 

 season, or in some longer-lived species may be 

 found in the butterfly state all the year round, 

 one brood continuing upon the wing until the 

 next is born. But as one season of the year dif- 

 fers from another in character, so is one brood of 

 butterflies often subject to influences which the 

 next avoids ; this often provokes a diverse habit 

 in different broods of the same insect. Some 

 species, moreover, hibernate as butterflies ; others 

 as chrysalids ; others, as we have seen already, 

 as caterpillars ; and a considerable number are 

 dependent for the continuation of the species 

 upon the power possessed by the egg to brave the 



